I talked to my primary care provider and got referred to a social worker who gave me referrals
The diagnosing took 3 sessions. An initial meeting, the testing, and then going over the results. I had to fill out paperwork, and also had my wife and parents fill out forms about me as well
Got diagnosed with adhd-pi at 35 yo
A number of things, except I think a bunch of them would be sorted if I just got diagnosed with adhd by high school